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A ball is thrown straight up in the air....

A ball is thrown straight up in the air. For which situation are both the instantaneous velocity and the acceleration zero ?

A

one the way up

B

at the top of its flight path

C

halfway up and halfway down

D

none of the above

Text Solution

Verified by Experts

The correct Answer is:
D
Once the ball has left the thrower's hand, it is a freely falling body with a constant, nonzero, acceleration of `a = -g`. Since the acceleration of the ball is not zero at any point on its trajectory, choices (a) through ( c) are all false and the correct response is (d).
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Knowledge Check

  • Let v and a represent instantaneous velocity and acceleration of a particle respectively.

    A
    Acceleration a can be zero when velocity `v =cancel0`
    B
    Acceleration a can be nonzero when velocity v=0
    C
    Acceleration a can be zero when velocity v=0
    D
    Acceleration a must be zero when velocity v=0.

  • A: A body is thrown with a velocity u inclined to the horizontal at an angle theta (theta gt 0, 90^(@)) . At the highest point, the angle between instantaneous velocity and acceleration is zero R: At the highest point velocity of the projectile is zero.

    A
    If both A and B are true and R is the correct explanation of A
    B
    If both A and R are true but R is not correct explantion of A
    C
    If A is true but R is false
    D
    If both A and R are false

  • A ball is thrown vertically upwards .Assuming the air resistance to be constant and considerable :

    A
    the time of ascent `lt` the time of descent
    B
    the time of ascent the tine of descent
    C
    the time of ascent = the time of descent
    D
    the time of ascent `gt` the time of descent
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